This guide is a starting point for resources on the Holocaust.
Quote from The Holocaust: An Introductory History, Jewish Virtual Library:
"The Holocaust (also called Ha-Shoah in Hebrew) refers to the period from January 30, 1933 - when Adolf Hitler became chancellor of Germany - to May 8, 1945, when the war in Europe officially ended. During this time, in Europe were subjected to progressively harsher persecution that ultimately led to the murder of 6,000,000 Jews (1.5 million of these being children) and the destruction of 5,000 Jewish communities. These deaths represented two-thirds of European Jewry and one-third of all world Jewry.
The Jews who died were not casualties of the fighting that ravaged Europe during World War II. Rather, they were the victims of Germany's deliberate and systematic attempt to annihilate the entire Jewish population of Europe, a plan Hitler called the “Final Solution” (Endlosung)."
The LCC call numbers below can help you find library books on the Holocaust. In addition to browsing these parts of the library shelves, it's also useful to look in Library Search, limiting the Resource Type to Books and using a combination of search terms that include "Holocaust." (Some books on the Holocaust will still be categorized under call numbers other than D. In addition, many library e-books do not have call numbers.)
D World History, not including America
D720-728 Period between World Wars (1919-1939)
D731-838 World War II (1939-1945)
D804 contains a concentration of work on the Holocaust
DD History of Germany
DD253-256.8 : Hitler, 1933-1945. National socialism
DS History of Asia
DS133-151 Jews outside of Palestine
The Holocaust Encyclopedia (United States Holocaust Museum)
The Holocaust Encyclopedia (e-book, 2001; editors Baumel-Schwartz and Laqueur)
Lexicon from Yad Vasehem: The World Holocaust Resource Center